Pressure-gage.



E. J. HAVERLY.

PRESSURE GAGE.

, APPLICATION FILED SEPT. 7, 1911.

1,043,591 3 Patented Nov. 5, 1912. F.

INVENTO/i I Z 717671 Eauer? ATTORNEYS ELMER J. I-IAVERLY, 01E" SAYRE,PENNSYLVANIA.

PRESSURE-GAGE.

Specification of Letters Patent.

Patented Nov. 5, 1912.

Application filed September 7, 1911. Serial No. 648,114.

To all whom it may concern:

Be it known that I, ELMER J. HAVERLY, a citizen of the United States,and a resident of Sayre, in the county of Bradford and State ofPennsylvania, have invented a new and Improved PressureGage, of whichthe following is full, clear, and exact description.

My invention relates generally to pressure gages and more particularlyto an adjustable means of connection between the expansible element andthe intermediate actuating devices for the pointer.

A further object of my invention is to provide such a means ofadjustment which will be simple in construction and eflicient inoperation, the construction and arrangement of the parts being such thatadjustments may be made without dismantling the gage.

Other objects and advantages of the invention will appear as thedescription thereof proceeds, the new and useful construction being setforth in the appended claim.

Reference is to be had to the accompanying drawings forming a part ofthis specification, in which similar characters of reference denotecorresponding parts in all the views, and in which- Figure 1 is a frontview of a gage equipped with my invention; Fig. 2 is a front view withthe index and scale removed; Fig. 3 is a vertical sectional view on theline 3 3 of Fig. 1; Fig. 4 is a bottom plan view of the connection byitself.

My invention is adapted for use in any gage wherein it is desired toimpart motion to a spindle carrying a pointer, the device shown in thedrawings being a steam gage embodying a casing 1 having the outlet 2thereon for connection to the steam pipe, the interior of the casingbeing provided with the usual hollow eXpansible element 3, straighteningof which, due to the pressure or the steam, imparts movement to theother elements to be now described.

A spindle 4 is suitably positioned within the casing, preferably insuitable brackets 5, 6, the outer end of this spindle having an index orpointer 7 thereon, together with the usual hair spring 8 for returningthe index to zero position. The intermediate portion of the spindle maybe of the same diameter as the end portions or it may be greater, asshown at 9 in Fig. 4:, there being a suitable securing means, such as ahook, positioned on thls portion of the spindle which is in pivotalengagement with a short link 11 having a curved end, portion 12 wherebywhen the parts are in the position shown in Figs. 1 and 2 the end of thelink may extend as far as possible around the spindle, thereby providingfor a greater range of movement of the spindle. The link 11 may be madein a plurality of pieces if so desired, the pieces being in pivotalengagementas at 100.

The free end 13 of the movable or expansible element 3 is provided witha screw 14twhich is adjustable therein, the head of the screw beingprovided with a suitable opening into which a similar element, such as amachine screw 15, engages, the short link 16 being pivotally connectedto this screw 15; pivotally mounted on a support 17 carried by thecasing 1 is a bell crank lever having a long arm 18 and a shorter arm19,-

the shorter arm being provided with an adjustable screw 20, which isprovided with a smaller screw 21 engaging the other end of the link 16,the outer end of the longer arm 18 being in pivotal engagement at 22with the end of the link 11. It is to be noted that the .points ofpivotal engagement of the screws 15, 21, with the larger screws 1 1, 20,is eccentric of these screws, that is, is a suitable distance from thecenter thereof. It is obvious that if pressure is applied internally tothe movable element 3 that the tendency of this element to straightenitself will turn the spindle 4: through the medium of the bell cranklever and the links 16 and 11 secured to the ends thereof, the link 12being also secured to the spindle 1.

The adjustmentof the index 7 may be positioned at zero, by movement ofthe adjustable screws l l and 20 with the consequent movement of thelink 16 connecting them whereby the spindle may be brought into theposition shown in Fig. 2. The spindle l is actuated against the torsionof the spring 8 so that when the pressure within the element 3 isremoved the index will come back to adjusted posit-ion. The screw 14engages the end 13 of the expansible element 3 merely by reason of thescrew threads thereon in the threaded opening on the end of this member,the same arrangement being used in determining the position of the screw20 in the shorter arm 19 of the bell crank; the engagement may be termedfrictional, the friction between the parts being suflicient to permitmovement thereof when the member 8 tends to straighten without turningthe screws themselves on their supports, the dial of the gage beingprovided with an opening 100 adjacent its top whereby the screws 14 and20 are accessible by merely removing the glass front of the gage.

Of course the length of the link 11 and the particular shape thereof maybe varied in order to adapt it to different gages having spindles ofdifferent diameters and having indexes thereon of different lengths;such'changes are embodied within the scope of my invention and areincluded within the appended claim.

Having thus v described my invention, I

claim as new, and desire to secure by Letters Patent A pressure gagecomprising the combination of an expansible tube, a screw in threadedengagement with the free end of the tube, a lever movably mounted in thegage, the lever being adapted to actuate the index of the gage, a screwin threaded engagement with the end of the lever, and a link extendingbetween the said screws, the

ends of the link being secured to the screws by means of threadedmembers engaging the said screws in eccentric positions.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

ELMER J. HAVERLY.

Witnesses E. M. DUNHAM, H. C. SAMUnLs.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. G.

